Struct RegexTokenizer

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pub struct RegexTokenizer { /* private fields */ }
Expand description

Tokenize the text by using a regex pattern to split.

Each match of the regex emits a distinct token, empty tokens will not be emitted. Anchors such as \A will match the text from the part where the last token was emitted or the beginning of the complete text if no token was emitted yet.

Example: 'aaa' bbb 'ccc' 'ddd' with the pattern '(?:\w*)' will be tokenized as followed:

Termaaacccddd
Position123
Offsets0,510,1516,21

§Example

use tantivy::tokenizer::*;

let mut tokenizer = RegexTokenizer::new(r"'(?:\w*)'").unwrap();
let mut stream = tokenizer.token_stream("'aaa' bbb 'ccc' 'ddd'");
{
    let token = stream.next().unwrap();
    assert_eq!(token.text, "'aaa'");
    assert_eq!(token.offset_from, 0);
    assert_eq!(token.offset_to, 5);
}
{
  let token = stream.next().unwrap();
    assert_eq!(token.text, "'ccc'");
    assert_eq!(token.offset_from, 10);
    assert_eq!(token.offset_to, 15);
}
{
  let token = stream.next().unwrap();
    assert_eq!(token.text, "'ddd'");
    assert_eq!(token.offset_from, 16);
    assert_eq!(token.offset_to, 21);
}
assert!(stream.next().is_none());

Implementations§

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impl RegexTokenizer

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pub fn new(regex_pattern: &str) -> Result<RegexTokenizer>

Creates a new RegexTokenizer.

Trait Implementations§

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impl Clone for RegexTokenizer

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fn clone(&self) -> RegexTokenizer

Returns a duplicate of the value. Read more
1.0.0 · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Tokenizer for RegexTokenizer

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type TokenStream<'a> = RegexTokenStream<'a>

The token stream returned by this Tokenizer.
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fn token_stream<'a>(&'a mut self, text: &'a str) -> RegexTokenStream<'a>

Creates a token stream for a given str.

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